Measure Reference Manual

a new file, the disk process reads the new blocks from cache (incrementing this counter) unless no
spare blocks are in cache.
The DRIVER-INPUT-CALLS counter counts all read operations, both cache hits and misses.
Counter type: Incrementing.
CACHE-WRITE-CLEANS
Number of times a required block is found clean in cache for a write operation, which saves a
disk read to bring the block in.
Counter type: Incrementing.
CACHE-WRITE-HITS
Number of times a write operation found the required block in cache and saved a read I/O (to
bring the block into cache). A write I/O might also be saved if the file has the buffered option set
ON (that is, if multiple writes can occur to a dirty block before it is physically written).
The DRIVER-OUTPUT-CALLS counter counts write operations that caused a disk I/O.
Counter type: Incrementing.
DBIO-INPUT-CALLS
Number of direct bulk I/O read operations to a requesting processor. This counter is a subset of
DRIVER-INPUT-CALLS.
Counter type: Incrementing.
DBIO-OUTPUT-CALLS
Number of direct bulk I/O write operations from a requesting processor. This counter is a subset
of DRIVER-OUTPUT-CALLS.
Counter type: Incrementing.
DRIVER-INPUT-CALLS
Number of read operations. The CACHE-HITS counter counts cache hits on read operations.
Counter type: Incrementing.
DRIVER-OUTPUT-CALLS
Number of write operations. The CACHE-WRITE-HITS counter counts cache hits on write operations.
Counter type: Incrementing.
LOCK-BOUNCES
Number of bounced locks (FELOCKED or error 73) returned by the disk process to the file system.
For SQL tables, a bounced lock is a result of using the CONTROL TABLE command with the
RETURN-IF-LOCKED option. For Enscribe files, a bounced lock is a result of using SETMODE function
4 with Param1.<15> = 1 (alternate lock mode).
Counter type: Incrementing.
LOCK-TIMEOUTS
Number of timeouts on locks (error 40). When a timeout value for a request expires, the file system
(Enscribe and SQL/MP) sends a cancel request to the disk process. If the disk process finds the
request still waiting for the lock to be granted, the request is removed from the lockwait queue,
and this counter is advanced.
Counter type: Incrementing.
214 Entities and Counters